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| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2009-03-20 14:55:55 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 14:56:36 -0700 |
| commit | 79af72d716cf1bb13b175429cf181a6c4d063ee8 (patch) | |
| tree | 2665c3e34983c8bcaf5fec76480fda163a88b045 /include | |
| parent | 068258bc15439c11a966e873f931cc8e513dca61 (diff) | |
| download | linux-stable-79af72d716cf1bb13b175429cf181a6c4d063ee8.tar.gz linux-stable-79af72d716cf1bb13b175429cf181a6c4d063ee8.tar.bz2 linux-stable-79af72d716cf1bb13b175429cf181a6c4d063ee8.zip | |
PCI: pci_is_root_bus helper
Introduce pci_is_root_bus helper function. This will help make code
more consistent, as well as prevent incorrect assumptions (such as
pci_bus->self == NULL on a root bus, which is not always true).
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pci.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 1216843412da..50d94388e87c 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -357,6 +357,15 @@ struct pci_bus { #define pci_bus_b(n) list_entry(n, struct pci_bus, node) #define to_pci_bus(n) container_of(n, struct pci_bus, dev) +/* + * Returns true if the pci bus is root (behind host-pci bridge), + * false otherwise + */ +static inline bool pci_is_root_bus(struct pci_bus *pbus) +{ + return !(pbus->parent); +} + #ifdef CONFIG_PCI_MSI static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) { |